package com.heima.gateway.filter;

import com.heima.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Service;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Service
@Slf4j
public class AutoFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //判断请求路径是否需要鉴权
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        if (request.getURI().getPath().contains("/login")){
            return chain.filter(exchange);
        }
        //如果不包含，判断是否有token
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //如果包含，校验
        try{
            Claims claims = AppJwtUtil.getClaimsBody(token);
            int tokenCode = AppJwtUtil.verifyToken(claims);
            if (tokenCode==0 || tokenCode==-1){
                Object userId = claims.get("id");
                request.mutate().header("userId",userId.toString());
                return chain.filter(exchange);
            }
        }catch (Exception e){
            log.error(e.getMessage());
        }

        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
